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Will there be an update of Pow-U with ESP32?

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During the design of Pow-U, one of the major challenges was to power it from the M-bus line on the HAN-port. In this way, Pow-U does not need a separate power supply.

We would love to use ESP32 also on Pow-U, but for the time being all versions of ESP32 consume too much power to make this possible. During S1/2022 we upgraded the Pow-K to use and ESP32-S2 module. However, also the S2 consumes too much power to be used on Pow-U.

We'll keep an eye on new products from Espressif, and as soon as a suitable and compatible module hits the market we'll start working on it!

But for the time being, the answer is sadly: No.

Update 5th September 2022

We have great news!

We finally found the solution, and have now redesigned the Pow-U around an ESP32-S2-MINI module. We have ordered a first production batch, and we expect to start shipping the new Pow-U around 1st October -22.

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  • Use Pow-U for Kamstrup
    By: Stian On 10-Oct-2022

    With the new ESP-32-S2-Mini, will Pow-U also be possible to use with Kamstrup? Currently only Pow-K module is said to work with Kamstrup HAN-NVE modules (

    Replied by: Egil Opsahl On 14-Oct-2022 No, the Kamstrup HAN-NVE module that provides M-bus has very limited current supply capability. You should use Pow-K on the Kamstrup meter.